libtommath/bn_mp_fwrite.c

#include "tommath_private.h"
#ifdef BN_MP_FWRITE_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis
 *
 * LibTomMath is a library that provides multiple-precision
 * integer arithmetic as well as number theoretic functionality.
 *
 * The library was designed directly after the MPI library by
 * Michael Fromberger but has been written from scratch with
 * additional optimizations in place.
 *
 * SPDX-License-Identifier: Unlicense
 */

#ifndef LTM_NO_FILE
int mp_fwrite(const mp_int *a, int radix, FILE *stream)
{
   char *buf;
   int err, len, x;

   if ((err = mp_radix_size(a, radix, &len)) != MP_OKAY) {
      return err;
   }

   buf = OPT_CAST(char) XMALLOC((size_t)len);
   if (buf == NULL) {
      return MP_MEM;
   }

   if ((err = mp_toradix(a, buf, radix)) != MP_OKAY) {
      XFREE(buf);
      return err;
   }

   for (x = 0; x < len; x++) {
      if (fputc((int)buf[x], stream) == EOF) {
         XFREE(buf);
         return MP_VAL;
      }
   }

   XFREE(buf);
   return MP_OKAY;
}
#endif

#endif

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